Decompression procedures for the safe ascent of aerospace personnel from ground level to altitude, supplement B Final report

Repetitive diving/flying decompression table for safe ascent to cabin pressure altitude

Fluorescent thermal imaging of a non-insulated pancake coil wound from high temperature superconductor tape

We have wound a 157-turn, non-insulated pancake coil with an outer diameter of 85 mm and we cooled it down to 77 K with a combination of conduction and gas cooling. Using high-speed fluorescent thermal imaging in combination with electrical measurements we have investigated the coil under load, including various ramping tests and over-current experiments. We have found found that the coil does not heat up measurably when being ramped to below its critical current. Two over-current experiments are presented, where in one case the coil recovered by itself and in another case a thermal runaway occurred. We have recorded heating in the bulk of the windings due to local defects, however the coil remained cryostable even during some over-critical conditions and heated only to about 82-85 K at certain positions. A thermal runaway was observed at the center, where the highest magnetic field and a resistive joint create a natural defect. The maximum temperature, ~100 K, was reached only in the few innermost windings around the coil former

Relationship between resistivity and specific heat in a canonical non-magnetic heavy fermion alloy system: UPt_5-xAu_x

UPt_(5-x)Au_x alloys form in a single crystal structure, cubic AuBe_5-type, over a wide range of concentrations from x = 0 to at least x = 2.5. All investigated alloys, with an exception for x = 2.5, were non-magnetic. Their electronic specific heat coefficient $\gamma$ varies from about 60 (x = 2) to about 700 mJ/mol K^2 (x = 1). The electrical resistivity for all alloys has a Fermi-liquid-like temperature variation, \rho = \rho_o + AT^2, in the limit of T -> 0 K. The coefficient A is strongly enhanced in the heavy-fermion regime in comparison with normal and transition metals. It changes from about 0.01 (x = 0) to over 2 micro-ohm cm/K^2 (x = 1). A/\gamma^2, which has been postulated to have a universal value for heavy-fermions, varies from about 10^-6 (x = 0, 0.5) to 10^-5 micro-ohm cm (mol K/mJ)^2 (x > 1.1), thus from a value typical of transition metals to that found for some other heavy-fermion metals. This ratio is unaffected, or only weakly affected, by chemical or crystallographic disorder. It correlates with the paramagnetic Curie-Weiss temperature of the high temperature magnetic susceptibility.Comment: 5 pages, 5 eps figures, RevTe

A Survey on Spherical Spline Approximation

Spline functions that approximate data given on the sphere are developed in a weighted Sobolev space setting. The flexibility of the weights makes possible the choice of the approximating function in a way which emphasizes attributes desirable for the particular application area. Examples show that certain choices of the weight sequences yield known methods. A convergence theorem containing explicit constants yields a usable error bound. Our survey ends with the discussion of spherical splines in geodetically relevant pseudodifferential equations

Regional intersectoral relations and demand projections with emphasis on the feed-livestock economy of the north central states

This study deals with the agricultural economy of the North Central States and the transactions that occur among the various sectors and related manufacturing and service businesses in the region. The analytical framework-the intersectoral transactions table-provides a means of organizing a vast amount of data pertaining to the North Central Region. In addition, the data that have been prepared can be used in evaluating major areas of investment opportunities in agriculture and agriculturally related business in the region. The evaluation of investment opportunities in this study starts with projections of manufacturing and other final demands for the agricultural products of the North Central Region and its subregions. According to the detailed estimates of demand for agricultural products outside of agriculture, for example, the North Central Region would fulfill more than 2.4 billion dollars of the 4.2 billion dollars expected increase (in constant 1955 dollars) in the demand for meat animals over the 20-year period from 1955 to 1975. A substantial part of the total increase in demand -about 1 billion dollars - would be for the meat-animals output of the Western Corn Belt; namely, Iowa, Minnesota and Missouri. The Northern Plains - North Dakota, South Dakota, Nebraska and Kansas - would account for 745 million dollars of the total regional demand, while the five states in the East North Central Region -Illinois, Wisconsin, Indiana, Ohio and Michigan - would account for the remaining 700 million dollars of the total. Thus, 41 percent of the total increase in the demand for the meat-animals output of north central agriculture would be concentrated in the Western Corn Belt, according to the findings of this study

Income Distribution Analysis for Rural Central Java: an Application of Social Accounting Methodology

IndonesianKetimpangan pendapatan merupakan masalah besar di negara-negara berkembang. Seringkali, kelompok-kelompok tertentu seperti wanita dan buruh tani mendapat perhatian khusus dalam analisa distribusi pendapatan. Tujuan penelitian ini adalah untuk menelusuri sumber-sumber pendapatan dari kelompok sasaran dengan menggunakan Social Accounting Matrix. Hasil analisis menunjukkan hubungan langsung dan tidak langsung antara aktivitas, komoditas dan faktor-faktor produksi dengan pendapatan serta pengaruh distribusinya diantara kelompok-kelompok sasaran

Negative Ion Drift and Diffusion in a TPC near 1 Bar

Drift velocity and longitudinal diffusion measurements are reported for a Negative Ion TPC (NITPC) operating with Helium + carbon disulfide gas mixtures at total pressures from 160 to 700 torr. Longitudinal diffusion at the thermal-limit was observed for drift fields up to at least 700 V/cm in all gas mixtures tested. The results are of particular interest in connection with mechanical simplification of Dark Matter searches such as DRIFT, and for high energy physics experiments in which a low-Z, low density, gaseous tracking detector with no appreciable Lorentz drift is needed for operation in very high magnetic fields.Comment: 7 pages, 3 figure

Codeless GPS Applications to Multi-Path: CGAMP

Cordless Global Positioning System (GPS) Applications to Multi-Path (CGAMP) is meeting the challenge of exploiting the L-band signals from the Global Positioning System (GPS) satellites for the measurement of the impulse response of radio transmission channels over space-Earth paths. This approach was originally suggested by E. K. Smith and has been pursued by J. Lemmon, without an affordable implementation being identifiable. In addition to the high cost of a suitable P code correlating GPS receiver, there is also the major impediment of the often announced Department of Defense policy of selective availability/anti-spoof (SA/AS) that clouds reliable access to the wideband (20 MHz) P channel of the GPS signals without cryptographic access. A technique proposed by MacDoran utilizes codeless methods for exploiting the P channel signals implemented by the use of a pair of antennas and cross correlation signal detection